Question

What is the maximum expansion or contraction allowed for the joint filler material with an initial gap of about 30 mm?

(a) 10 mm

(b) 5 mm

(c) 20 mm

(d) 30 mm

I got this question by my school principal while I was bunking the class.

This key question is from Joints Provision and Water Bars in RCC Ducts of Aqueducts in division Cross Drainage Work of Irrigation Engineering

Answer 1

Right answer is (a) 10 mm

Best explanation: Joint fillers are normally compressible sheets or strip materials that are used as spacers and they are fixed to the face of first placed concrete. The maximum permissible expansion or contraction is of the order of 10 mm.